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  Subjects -> CHEMISTRY (Total: 837 journals)
    - ANALYTICAL CHEMISTRY (48 journals)
    - CHEMISTRY (586 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (46 journals)
    - PHYSICAL CHEMISTRY (68 journals)

ANALYTICAL CHEMISTRY (48 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 111)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 10)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 21)
American Journal of Analytical Chemistry     Open Access   (Followers: 28)
Analytica Chimica Acta     Hybrid Journal   (Followers: 33)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 29)
Analytical Chemistry     Full-text available via subscription   (Followers: 204)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Chemistry Research     Open Access  
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 24)
Current Analytical Chemistry     Hybrid Journal   (Followers: 6)
Drug Testing and Analysis     Hybrid Journal   (Followers: 5)
Electroanalysis     Hybrid Journal   (Followers: 5)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 5)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 5)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 5)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 5)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 16)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 4)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 4)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 18)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 7)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 20)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 1)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
World Journal of Analytical Chemistry     Open Access  
Journal Cover   Journal of Analytical Chemistry
  [SJR: 0.33]   [H-I: 19]   [16 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2292 journals]
  • Planar electrodes based on carbon nanotubes for the potentiometric
           determination of homologous sodium alkyl sulfates
    • Abstract: Abstract Planar electrodes based on carbon nanotubes, manufactured by screen printing, are proposed for the determination of anionic surfactants in aqueous solutions. A comparative analysis of the electroanalytical characteristics of planar and solid-state sensors based on various ionophores, namely, ion associates of (1) sodium dodecyl sulfate with a cationic complexes of copper(II) and N,N′-bis(salicylidene)ethylenediamine and (2) sodium dodecyl sulfate with cetylpyridinium, is performed. It is shown that planar electrodes can be used to quantify homologous sodium alkyl sulfates in the concentrations range of 4 × 10−7 (5 × 10−6) to 1 × 10−2 (5 × 10−4) M at pH 4–10 in water bodies and to determine the total concentration of anionic surfactants in detergents.
      PubDate: 2015-07-01
       
  • Optimization of Soxtec extraction procedure for determination of
           polybrominated diphenyl ethers in bivalve mollusc
    • Abstract: Abstract A comprehensive and efficient method is presented for the determination of 9 polybrominated diphenyl ether congeners (PBDEs), 2,4,4′-tribromodiphenyl ether (PBDE-28), 2,3′,4,4′-tetrabromodiphenyl ether (PBDE-47), 2,2′,4,4′,6-pentabromodiphenyl ether (PBDE-66), 2,2′,4,4′,5-pentabromodiphenyl ether (PBDE-100), 2,2′,3,4,4′-pentabromodiphenyl ether (PBDE-99), 2,2′,4,4′,5,6′-hexabromodiphenyl ether (PBDE-85), 2,2′,4,4′,5,5′-hexabromodiphenyl ether (PBDE-154), 2,2′,4,4′,5,5′-hexabromodiphenyl ether (PBDE-153) and 2,2′,3,4,4′,5,6′-heptabromodiphenyl ether (PBDE-183), in mollusc bivalve samples. An experimental design was used to evaluate the influence of several operational parameters on the extraction performance and to obtain the best experimental conditions. Under the final working conditions, freeze-dried mollusc was placed in the Soxtec thimble in order to extract PBDEs with 100 mL of n-hexane-acetone (4: 1) after 1.5 h and 1 h of boiling and rinsing times, respectively. Soxtec extracts were additionally purified on a multilayered column and after injected in the gas chromatography combined with mass spectrometry (GC-MS) system. Quantitative recoveries of the analytes at three concentration levels ranged between 80 and 108%, and limits of quantification of the method (LOQs) between 0.5 and 20 ng/g. Analysis of mussel and clam samples showed that PBDE-47 and PBDE-99 were presented in almost all samples with concentrations between 0.6 and 2.6 ng/g dry weight. Moreover, a certified reference material (NIST 2974a) was used. The obtained concentrations were in agreement with the certified values.
      PubDate: 2015-07-01
       
  • A highly sensitive spectrophotometric determination of sodium
           2-sulfanylethanesulfonate in pharmaceutical preparations
    • Abstract: Abstract The aim of this research was to develop a new sensitive and simple spectrophotometric method for the determination of sodium 2-sulfanylethanesulfonate (SSES) with leucocrystal violet. The procedure is based on a redox reaction occurring between the SSES and potassium iodate in an acidic medium. Formed in stoichiometric quantity iodine oxidizes leucocrystal violet to the crystal violet dye, whose coloring is a base of the spectrophotometric measurements. The crystal violet dye formed shows maximum and stable absorbance at pH = 4.1 ± 0.1 and λ = 590 nm. The molar absorptivity, limit of detection and limit of determination of the method were calculated to be 6.98 × 104 L/mol cm, 0.10 and 0.13 μg/mL, respectively. The color system obeys Beer’s law in the range 0.2–2.0 μg/mL of SSES. The optimum analytical conditions were evaluated. The proposed method has been successfully applied to the determination of SSES in pharmaceutical preparations, without the need of any complicated instrumentation. Reliability of determination was confirmed applying standard iodometric method, recommended by European and Polish Pharmacopoeia.
      PubDate: 2015-07-01
       
  • Residue analysis and dissipation of fenoxaprop-P-ethyl and its metabolite
           fenoxaprop-P in rice ecosystem
    • Abstract: Abstract Fenoxaprop-P-ethyl is widely applied in rice ecosystem for weeding. A simple and accurate method for determination of fenoxaprop-P-ethyl and its metabolite fenoxaprop-P in paddy water, paddy soil, rice plants, husked rice, straw and rice hull was established by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS-MS). Recoveries of fenoxaprop-P-ethyl and fenoxaprop-P in these matrices at three spiking levels ranged from 75.1 to 102.8% with relative standard deviations (RSDs) of 1.6 to 8.2%. The limits of detection (LODs) of fenoxaprop-P-ethyl and fenoxaprop-P were 0.003 mg/kg. Fenoxaprop-P-ethyl dissipated rapidly to fenoxaprop-P in paddy water and soil during hours. The half-life of fenoxaprop-P-ethyl in rice plants was 1.26–1.41 days, and the half-life of fenoxaprop-P in paddy water, paddy soil and rice plants was 1.87–1.93, 1.61–2.31 and 1.82–1.93 days. The ultimate residues of fenoxaprop-P-ethyl and fenoxaprop-P in paddy soil, straw, rice hull and husked rice samples at harvest were not detectable or below 0.01 mg/kg.
      PubDate: 2015-07-01
       
  • Biosensors as tools of environmental monitoring for organophosphorus nerve
           agents
    • Abstract: Abstract Current advances in the development of tools of environmental monitoring for anticholinesterase agents are considered. The aim of this analysis was to substantiate the most promising trends in the development of an up-to-date biosensor based on cholinesterase inhibition with an optimum sensitivity-analytical-signal formation time relation for the monitoring of atmospheric air for organophosphorus warfare agents and insecticides.
      PubDate: 2015-07-01
       
  • Ghezeljeh montmorillonite nanoclay as a natural adsorbent for solid phase
           extraction of copper ions from food samples
    • Abstract: Abstract We demonstrate here the extraction and removal of Cu2+ ion from aqueous solutions by Ghezeljeh montmorillonite nanoclay as a new natural adsorbent material. A copper measurement is carried out by applying the solid phase extraction method in batch mode followed by atomic absorption spectroscopy. The clay is characterized by using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The results of XRD and FTIR of nanoclay confirm that montmorillonite is the dominant mineral phase. Based on SEM images of clay, it can be seen that the distance between the plates is nano. The limits of detection and quantification are 1 and 10 μg/L, respectively. The dynamic linear range is within the range of 10 to 50 μg/L. The adsorption capacity and preconcentration factor are 0.65 mg/g and 102, respectively. The experimental method has been successfully applied for the determination of Cu2+ ion in a variety of real water and food samples without interfering effect of various cations and anions.
      PubDate: 2015-07-01
       
  • Dimethylformamide-fluoride supporting electrolytes used as new media for
           the voltammetric determination of gadolinium(III)
    • Abstract: Abstract New supporting electrolytes based on dimethylformamide-fluoride aqueous solutions are proposed for the voltammetric determination of low amounts of gadolinium(III). The electrochemical behavior of gadolinium(III) in fluoride solutions of dimethylformamide (DMFA) is studied. It is shown that gadolinium(III) is irreversibly reduced with the involvement of one electron at the diffusion-kinetic control of the maximum current. The kinetic parameters of the studied process are determined, the composition of gadolinium(III) complexes predominant in solution and discharged on the electrode is found. A method is proposed for the voltammetric determination of gadolinium(III) in aqueous dimethylformamide-fluoride solutions.
      PubDate: 2015-07-01
       
  • An oxalate-selective electrode and its application to analysis
    • Abstract: Abstract It is shown that the improvement of the steric accessibility of exchange centers of higher quaternary ammonium salts by replacing three long-chain radicals (octadecyl) with three methyl radicals and the addition of a neutral carrier, p-trifluoroacetylbenzoic acid heptyl ester, significantly enhance the selectivity of an oxalate-selective electrode and lower the detection limit. An electrode reversible to oxalate ions is proposed. A procedure is developed for determining oxalate ions in green and black tea.
      PubDate: 2015-07-01
       
  • Specific features of the determination of betacyanins by reversed-phase
           high-performance liquid chromatography
    • Abstract: Abstract The stability and behavior of beet betacyanins in reversed-phase HPLC and in solid-phase purification on Diapak C18 concentrating cartridges have been studied. It has been demonstrated that, in acidic mobile phases and solutions with pH < 4.0, the decyclization of betacyanins is the main reason for their instability. The differences in the adsorption of betanin and isobetanin with changes in the pH of the mobile phase have been determined. A method has been developed for the solid-phase purification of betacyanins from natural extracts with the yield higher than 90% followed by determination by HPLC with gradient elution.
      PubDate: 2015-07-01
       
  • Extraction-chromatographic determination of zinc dithiophosphates in
           engine oils
    • Abstract: Abstract State-of-the-art problems of the determination of zinc dithiophosphates in engine oils are considered. Zinc dithiophosphates are used as multifunctional additives in engine oils and determine their antioxidant, antiwear, and antifriction properties. The factors that prevent the determination of additives in the test samples and methods for their elimination are studied. The analytical methods used for the screening and determination of zinc dithiophosphates in engine oils are assessed. Given the complexity of the oil matrix, the procedure including the preseparation of analytes on hydroxylated silica using solid-phase extraction and the separation of the base oil components and some additives by two-stage extraction followed by the detection of analytes by high-performance liquid chromatography (HPLC) should be considered the most suitable for determining zinc dithiophosphates. The proposed procedure for the determination of zinc dithiophosphates in engine oils was tested on a number of commercial samples with satisfactory results.
      PubDate: 2015-07-01
       
  • Detection of halogenated organics by their inhibitory action in a
           catalytic reaction between dimethyl acetylenedicarboxylate and
           2-methyl-4-nitroaniline
    • Abstract: Abstract The purpose of this paper is to report on the detection of toxic halogenated organic compounds in water using their inhibitory action on a pyridine-catalyzed reaction between dimethyl acetylenedicarboxylate (DMAD) and 2-methyl-4-nitroaniline (MNA). Previous work has shown that similar techniques can successfully lower the detection limit of sulfides and arsines in water samples, compared to their standard photometric detection methods. This paper highlights the optimization, selectivity, and sensitivity studies of the proposed sensing scheme. Optimization shows that the pyridine-catalyzed reaction is more favorable at 4 mM DMAD and 8 mM MNA. It was also determined that the inhibitory effect of halogenated organic compounds is more pronounced when carried out at 60°C. Using optimized reaction conditions, the limit of quantification for the four regulated trihalomethanes (THMs) was approximately 80 ppm. In addition, the sensing method is selective to THMs and a few other halogenated organics. These promising results demonstrate the further success of this technique for sensitive, selective detection, and future work will be carried out to incorporate the technique in sensing applications for THMs in drinking water.
      PubDate: 2015-07-01
       
  • Determination of trace nitrites and nitrates in human urine and plasma by
           field-amplified sample stacking open-tubular capillary
           electrochromatography in a nano-latex coated capillary
    • Abstract: Abstract The associations of nitric oxide (NO) with many diseases are still being discovered, and sometimes, NO levels in the body fluids are too low to be detected. Thus, the determination methods for trace nitrites and nitrates in urine and plasma of healthy volunteers and rheumatoid arthritis (RA) patients are necessary. Using trimethylamine aminated polychloromethyl styrene nano-latex coated capillary column (ccc-TMAPL) and field-amplified sample stacking (FASS) injection, the sensitive open-tubular capillary electrochromatography (OT-CEC) methods for determining trace nitrites and nitrates in urine and plasma of healthy volunteers and RA patients were set up. The limits of detection for both nitrite and nitrate were 1 ng/mL. The intra- and inter-day relative standard deviations (RSDs) of the methods were less than 1.9%, and recoveries were between 89 and 96%. Plasma nitrate (diluted 10 times) levels were 93–301 ng/mL for healthy volunteers and 222–421 ng/mL for RA patients, respectively. Meanwhile, plasma nitrite levels were 7–18 and 40–82 ng/mL, respectively. The urinary nitrite levels were significantly elevated in RA patients. The proposed sensitive FASS-OT-CEC methods for trace nitrites and nitrates hold the promise of practical applications in a wide array of biological analyses, clinical and pathophysiology studies of the diseases related with NO hyperproduction and metabolites.
      PubDate: 2015-07-01
       
  • A chromatographic-mass spectrometric method for the determination of
           moxifloxacin in blood plasma for pharmacokinetic studies
    • Abstract: Abstract A method for the determination of moxifloxacin in human blood plasma has been developed and validated by reversed-phase HPLC on a YMC-Triart C18 (150 × 2.0 mm, 3 μm) column with mass spectrometric detection. Sample preparation has been performed by solid-phase extraction on Waters Sep-Pak cartridges. The recovery of moxifloxacin was 90 ± 3%. A quadrupole mass analyzer with electrospray ionization has been used for detection at m/z 402.2 and 362.2 for moxifloxacin and ofloxacin (internal standard), respectively. The lower limit of the analytical range was 1 ng/mL. The developed method has been used for the pharmacokinetic study of moxifloxacin.
      PubDate: 2015-07-01
       
  • Identification and determination of antibiotics from various classes in
           food- and feedstuffs by matrix-or surface-assisted laser
           desorption/ionization mass spectrometry
    • Abstract: Abstract Methods are proposed for the identification and determination of residual quantities of antibiotics from various classes in food- and feedstuffs for animals by matrix-or surface-assisted laser desorption/ionization mass spectrometry (MALDI/SALDI MS). It is shown that acetonitrile is efficient for the extraction of antibiotics without additional extract purification. The limits of detection for antibiotics in the indicated products are 0.01–0.3 μg/kg in MALDI MS and 0.001–0.03 μg/kg in SALDI MS at the signal-to-noise ratio 4. The relative standard deviation of the results of determination of antibiotics does not exceed 10% in feedstuffs and premixes at the analytical range 20–400 mg/kg for monensin and narasin, 0.2–200 mg/kg for tilmicosin, and 20–1000 mg/kg for avilamycin and a weighed portion of feedstuff 1.0 g. The time of analysis is 40–50 min.
      PubDate: 2015-07-01
       
  • Determination of 2-aminoacetophenone in white wines using ultrasound
           assisted SPME coupled with GC-MS
    • Abstract: Abstract The unpleasant odor of an off-flavor is mostly caused by only one or, sometimes, several volatile compounds with very low odor threshold values giving the typical unpleasant odor taint of the spoiled food product. 2-Aminoacetophenone is an aroma compound which causes the untypical aging off-flavor in Vitis vinifera white wines. Ultrasound assisted headspace solid phase microextraction (UA-HS-SPME) and direct immersion solid phase microextraction (DI-SPME) coupled with gas chromatography-mass spectrometry (GC-MS) were tested and optimized for determination of 2-aminoacetophenone in Riesling wines fermented by different yeast strains.
      PubDate: 2015-07-01
       
  • Preconcentration and determination of osmium(VIII) using silicas
           chemically modified with sulfur-containing groups
    • Abstract: Abstract The adsorption of osmium(VIII) from sulfuric and hydrochloric acid solutions and gas phase on silicas chemically modified by dithiocarbamate, thiodiazolthiol, mercaptophenylpropylurea, and aminobenzothiazolpropyl groups is studied. A procedure is developed for the adsorption-photometric determination of osmium, including the adsorption of osmium(VIII) from the gas phase on silicas chemically modified by sulfur-containing groups and the determination of osmium in the adsorbent phase by diffuse reflection spectroscopy. The procedure was used to determine osmium in a certified reference material of the composition of a matte ore thermal melting and process waters.
      PubDate: 2015-07-01
       
  • Determination of anionic surfactants using methods of impedance
           spectroscopy and chemometrics
    • Abstract: Abstract A procedure is developed for the determination of anionic surfactants (ASs) in water-oil emulsions by impedance spectroscopy with the chemometric processing of experimental data. The conditions of recording impedance titration curves were optimized and the performance characteristics of the procedure were estimated. It was shown that impedance spectroscopic titration is applicable to the determination of AS in aqueous solutions and water-oil emulsions in the presence of organic and inorganic substances. Examples of determination of ASs based on sodium olefin sulfonate are given.
      PubDate: 2015-07-01
       
  • Simultaneous detection and quantification of zeatin and kinetin in coconut
           water using ultra performance liquid chromatography coupled with a simple
           step solid phase extraction
    • Abstract: Abstract Trans-zeatin and kinetin are two cytokinin family members that exhibit an anti-aging effect on human fibroblast cells. These cytokinins can be found in coconut water and in the xylem sap of most plants. This study describes the first attempt of a simultaneous separation of zeatin and kinetin using a simple C18 solid phase extraction (SPE) method coupled with ultra performance liquid chromatography (UPLC). This method provided high recoveries of 95.2 and 98.6% for trans-zeatin and kinetin, respectively. Malayan Green Dwarf, a local coconut variety, was found to contain 14 μg/L trans-zeatin and 4 μg/L kinetin. This method will be useful for comprehensive research on different coconut varieties and determining the contents of cytokinins in coconut water.
      PubDate: 2015-07-01
       
  • Determination of the parameters of molecular-weight distribution of
           hydroxyethyl starches by diffusion-ordered NMR spectroscopy
    • Abstract: Abstract The possibility of the application of diffusion-ordered NMR spectroscopy to the study of the molecular-weight distribution of hydroxyethyl starch is investigated. The use of regression equations relating these parameters to the coefficients of the self-diffusion of polymer macromolecules as a whole, namely, the average coefficient of self-diffusion D s and the coefficient of self-diffusion at the peak maximum D p, is proposed for the quantitative assessment of weight-average (M w) and number-averaged (M n) molecular weights and molecular weight at the peak maximum (M p). It is shown that the determination of M w, M n, M p based on the data on D s gives the best results. It was found that the values of polydispersity indexes found using diffusion-ordered NMR spectroscopy are independent of the choice of diffusion parameter D s or D p.
      PubDate: 2015-07-01
       
  • A new fluorinated polymer as a modifier for liquid chromatography and
           capillary electrophoresis
    • Abstract: Abstract The potential of a newly synthesized fluorinated copolymer of perfluoro(3,6-dioxa-4-methyl-8-nonene)sulfonyl fluoride with ethylene (AE FS-101SK) as a modifier of eluent in liquid chromatography and of background electrolyte in capillary electrophoresis is studied. It was found that, in reversed-phase HPLC, the use of a fluorine-containing modifier improves efficiency for hydrophobic adsorbates (steroid hormones and fat-soluble vitamins). In capillary electrophoresis, AE FS-101SK added to a background electrolyte can both modify the quartz capillary walls and act as a pseudostationary phase, enabling the separation of neutral analytes. In the simultaneous use of a fluorinated polymer modifier and sodium dodecyl sulfate in the composition of the background electrolyte, efficiency of 900 000 theoretical plates/m was achieved in the separation of steroid hormones by micellar electrokinetic chromatography.
      PubDate: 2015-06-01
       
 
 
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